You would like to modify how what language the endpoint agent response rule popup's display in.Such as the Title Bar, Banner, and user response check box.
The initial text in the body is specified by the +Language section of the related response rule, if the the response rule is triggered on a system that does not match the +Language, then the response rule "text" will default to English.
Change the system locale to the language of your choice using these instructions:
Change the System Locale for Windows XP, Vista and Windows 7
Note: You must be logged in with an account that has Administrative Privileges.
For Windows XP: Double click the Regional and Language Options icon.
The Regional and Language Options dialog box appears.
For Windows XP and Vista: Click the Advanced tab.
(If there is no Advanced tab, then you are not logged in with administrative privileges.)